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DraconicAcid
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It looks like an air condensor, but I'd expect those to be longer.
Please remember: "Filtrate" is not a verb.
Write up your lab reports the way your instructor wants them, not the way your ex-instructor wants them.
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Cathoderay
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Quote: Originally posted by Organikum  | Got this lamp, labeled "Phillips M13", 0,5 ohm and I suspect it might be a spektral lamp producing only a certain part of the lights spectrum.
Could not find anything on the net, what is strange, so I ask here:
What kind of lamp for what spectrum and what application is this?
thx
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I don't think it is a lamp. A lot depends on the details at the end opposite the wire.
It could be a heater.
It could be a electrochemistry probe.
Maybe even a temperature probe.
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danton
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coming rather late to the conversation but it's a thistle funnel with an airlock isn't it?
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Morgan
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I have some test tubes that are 25 cm long and 20 mm wide with a 2.5 mm wall thickness. In small lettering near the top is the word PYREX. But about 3
cm below the top there's a gentle hourglass constriction of about 2.5 cm long in the length. I was just wondering what they might be called or used
for.
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bnull
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Do you have some pictures?
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Morgan
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It's just a typical round bottom test tube with no flare or rim at the top. It's thickish though and looks most like the tube at the top of the photo
but with a gradual constriction. Maybe it's this type.
https://cdn.thomassci.com/_resources/_global/media/resized/0...
https://www.thomassci.com/Laboratory-Supplies/Digestor-Tubes...
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Texium
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Post a picture of yours. If it gets narrower and more hourglass-like than the ones you linked to, they might just be ampoules.
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Morgan
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The tubes feel heavy for a test tube and weigh a little over 75 grams each. The wall thickness again 2.5 mm.
[Edited on 10-12-2024 by Morgan]
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bnull
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They look like simple Carius tubes. The fancier types have a sort of "J" side arm or a tube with smaller diameter fused to the opening. You seal
substances inside them and submit the tubes to heat (up to 350 °C or so) in a special furnace, which is called bomb for, well, obvious reasons. The
constriction is there to facilitate the sealing process. If you're careful enough, you can use them multiple times until they're too short to be
sealed again.
Where did you get them?
[Edited on 10-12-2024 by bnull]
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Morgan
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I bought 5 of them on eBay several years ago just looking at lab glass stuff for sale, being an interesting shape heavy-wall Pyrex tube and new
unused.
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Morgan
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Kind of an interesting write-up on Carius, his life and demise.
https://www.chemistryworld.com/opinion/carius-tube/3004904.a...
A little humor about Carius tubes and stuff ...
"A difficulty which limits the usefulness of the Carius method for
the determination of halogens and sulfur in organic substances is the
frequent breakage of the tubes during the decomposition with fuming
nitric acid. This is so well known that the procedure has been referred to as the "precarious method." In connection with the use of
sealed tubes for the decomposition of some minerals and refractory
metallic substances with hydrochloric acid [7],1 observations were
made which appeared to explain the frequent failures of Carius tubes
and which suggested a simple modification that will obviate most
such failures. Carius tubes as supplied in Pyrex laboratory glass are long, heavy- walled tubes, ranging up to 19 mm in inside diameter, and with a
con- striction near the open end to facilitate sealing. The bursting pres- sure of several of these tubes of 15-mm inside diameter (wall thickness
approximately 2.5 mm), when sealed with reasonable care but without
special attention to annealing, ranged from 1,000 to 1,400 pounds per
square inch. An effort was made to " smoke" some of these seals, but
difficulties in handling the filled tubes precluded any good smoking
operation. The bursting pressure of tubes sealed without smoking
have not differed noticeably from those "smoked."
https://nvlpubs.nist.gov/nistpubs/jres/30/jresv30n2p107_A1b....
[Edited on 10-12-2024 by Morgan]
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Morgan
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| Quote: Originally posted by bnull | They look like simple Carius tubes. The fancier types have a sort of "J" side arm or a tube with smaller diameter fused to the opening. You seal
substances inside them and submit the tubes to heat (up to 350 °C or so) in a special furnace, which is called bomb for, well, obvious reasons. The
constriction is there to facilitate the sealing process. If you're careful enough, you can use them multiple times until they're too short to be
sealed again.
Where did you get them?
[Edited on 10-12-2024 by bnull] |
This pretty much matched the specs on my Pyrex 20 mm diameter tubes. Thanks.
"Carius tubes as supplied in Pyrex laboratory glass are long, heavy- walled tubes, ranging up to 19 mm in inside diameter, and with a constriction
near the open end to facilitate sealing."
The inside diameter and wall thickness specifically ...
"The bursting pressure of several of these tubes of 15-mm inside diameter (wall thickness approximately 2.5 mm), when sealed with reasonable care but
without special attention to annealing, ranged from 1,000 to 1,400 pounds per square inch."
https://nvlpubs.nist.gov/nistpubs/jres/30/jresv30n2p107_A1b....
[Edited on 11-12-2024 by Morgan]
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currawong
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I recently got this as a freebie with some other glassware and borosilicate tubing I purchased from a seller who salvaged all of it from a skip bin at
Western Sydney University. The seller claimed it was a burette, but I doubt he knew what most of the glassware he had was and it doesn't look like the
burettes I have used for titrations at school. The ground joint is frozen and I have'nt been able to free it, although I have been very gentle with
it. I'm not sure why it uses glass instead of a Teflon/PTFE stopcock. I also can't see how I could get liquid into it.
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currawong
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Here's another picture showing a hole in the top of it, presumably to either let air in or out
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Sulaiman
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it is an autofill burette
https://www.itm.com/product/bel-art-37915-1025-borosilicate-...
https://www.belart.com/bel-art-f37915-1025-borosilicate-glas...
CAUTION : Hobby Chemist, not Professional or even Amateur
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charley1957
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When I worked in a gas processing plant we used these with a Karl Fisher solution to determine the water content of the sweetening chemical in the
plant. You squeezed a rubber bulb to force the solution up into the burette and it leveled itself out at zero, or full scale.
You can’t claim you drank all day if you didn’t start early in the morning.
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Morgan
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How to use the Burkle Automatic Burette
https://www.youtube.com/watch?v=KxUk7PoHXo8
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currawong
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Thanks, that is really interesting. Is there any obvious reason why a glass stopcock was used? I have a limited amount of experiance with glassware
but I have only seen PTFE used and I am finding it very difficult to free the frozen joint (already tried soaking in acetone, water, a hairdryer and
using WD40)
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